For the data in Exercises 15 in Sections 10€“1 and 10€“2 and 17 in Section 10€“3, find the 90% prediction interval when x = 4 years.
The director of an alumni association for a small college wants to determine whether there is any type of relationship between the amount of an alumnus€™s contribution (in dollars) and the years the alumnus has been out of school. The data follow.
Years and contribution data are as follows:

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1 53 10 7 6 Years r Contribution y, S 500 100 300 50 75 80